The Physics Society of Iran Iranian Journal of Physics Research 1682-6957 23 2 2023 08 23 Investigation of ZnS-Mg thin films prepared by sol-gel method Investigation of ZnS-Mg thin films prepared by sol-gel method 247 254 3392 10.47176/ijpr.23.2.11608 FA Mahdi Gholampour Department of Physics, Faculty of Basic Science, Imam Ali University, Tehran, Iran Mahdi Simiari Department of Physics, Faculty of Basic Science, Imam Ali University, Tehran, Iran Sobhan Kazempour Ishka Department of Physics, Faculty of Basic Science, Imam Ali University, Tehran, Iran 0000-0003-3935-8205 Journal Article 2022 11 27 In this paper, different aspects of making ZnS and ZnS-Mg thin films coated on germanium (Ge) substrate are studied by the sol-gel method. The main goal is to preserve the optical window property of ZnS-Mg thin films that can be used in infrared thermal imaging systems.<strong> </strong>First, the method of synthesizing transparent and stable sols of ZnS and ZnS-Mg is studied. In this regard, the best molar ratio of materials, the best temperature, and the best conditions for the preparation of ZnS and ZnS-Mg sols are presented. Subsequently, the essential aspects of the spin coating of thin films on the germanium (Ge) substrate are evaluated. These components include; the best rotation speed, best drying temperature, and the best annealing temperature under Argon gas. Furthermore, according to Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and UV-VIS transmission spectroscopy, we characterized the chemical bond, crystal structure, and the optical window property of infrared spectrum transmission for the ZnS-Mg thin films which deposited on Germanium substrate.<strong> </strong>Finally, the preservation and existence of the optical window property of the infrared transmission spectrum in ZnS-Mg thin films are shown. In this paper, different aspects of making ZnS and ZnS-Mg thin films coated on germanium (Ge) substrate are studied by the sol-gel method. The main goal is to preserve the optical window property of ZnS-Mg thin films that can be used in infrared thermal imaging systems.<strong> </strong>First, the method of synthesizing transparent and stable sols of ZnS and ZnS-Mg is studied. In this regard, the best molar ratio of materials, the best temperature, and the best conditions for the preparation of ZnS and ZnS-Mg sols are presented. Subsequently, the essential aspects of the spin coating of thin films on the germanium (Ge) substrate are evaluated. These components include; the best rotation speed, best drying temperature, and the best annealing temperature under Argon gas. Furthermore, according to Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and UV-VIS transmission spectroscopy, we characterized the chemical bond, crystal structure, and the optical window property of infrared spectrum transmission for the ZnS-Mg thin films which deposited on Germanium substrate.<strong> </strong>Finally, the preservation and existence of the optical window property of the infrared transmission spectrum in ZnS-Mg thin films are shown. https://ijpr.iut.ac.ir/article_3392_6463c88460bd63bbe256e495c63aa40b.pdf